JP2010266000A - Overflow preventing valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an overflow preventing valve having relatively simple construction for resetting the condition of the overflow preventing valve into a non-operated condition after the overflow preventing valve is operated. <P>SOLUTION: The overflow preventing valve 100 includes a first tubular member 10, a valve element 20, a second tubular member 30, and a coil spring 40. The first tubular member 10 has an inflow port 12 into which high pressure gas flows, a first gas flow path 13, and a valve chamber 14. The valve element 20 is provided in the valve chamber 14. The second tubular member 30 has a valve seat part 31, a second gas flow path 33, an outflow port 34, and an O-ring 37. The coil spring 40 energizes the valve element 20 to be separated from the valve seat part 31. On the inner wall of the first tubular member 10, a protruded part 16 is provided which abuts on the valve element 20 to restrict the movement of the valve element 20 to the side of the outflow port 34 when a seated face 31f is moved to the side of the outflow port 34 beyond the protruded part 16. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an overflow prevention valve.

  A supply device that supplies high-pressure fluid such as high-pressure gas is provided with an overflow prevention valve in addition to an on-off valve such as a solenoid valve, a flow rate adjustment valve, and the like. This overflow prevention valve opens when the fluid below the predetermined flow rate flows and causes the fluid to flow out. On the other hand, the fluid above the predetermined flow rate flows due to a failure of the on-off valve or the flow rate adjustment valve, for example. In some cases, the valve is closed to block outflow of fluid.

  By the way, when this overflow prevention valve is operated and closed, in order to reuse the overflow prevention valve, the state of the overflow prevention valve is changed to the non-operating state, that is, the valve open state. It is necessary to return to Conventionally, various techniques for returning the state of the overflow prevention valve to the non-operating state have been proposed (for example, see Patent Documents 1 to 3 below).

JP 2002-156061 A Japanese Patent Laid-Open No. 10-169813 JP 2001-4063 A

  However, in the technique described in the above-mentioned patent document, it is necessary to provide the overflow prevention valve with an actuator for moving the position of the valve body in order to return the state of the overflow prevention valve to the non-operating state. In addition, the structure of the overflow prevention valve is relatively complicated. Furthermore, when an actuator is provided in the overflow prevention valve, it is necessary to seal the connecting portion between the main body of the overflow prevention valve and the actuator, which further complicates the configuration of the overflow prevention valve.

  The present invention has been made in order to solve the above-described problem. In the overflow prevention valve, the overflow prevention valve is in a non-operating state after the overflow prevention valve is operated with a relatively simple configuration. An object of the present invention is to provide a technique capable of returning to the state of time.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 An overflow prevention valve having a first tubular shape having an inflow port through which fluid flows from the outside, a first fluid flow path through which the fluid flowing in from the inflow port flows, and a valve chamber A member, a valve body provided in the valve chamber so as to be movable along the axial direction of the first tubular member, and mounted in the interior of the first tubular member so as to be movable along the axial direction A second tubular member that is configured to communicate with the first fluid flow path when the valve body is not seated on the valve seat, A second fluid flow path that is not in communication with the first fluid flow path when the valve body moves along the axial direction and is seated on the valve seat portion; and the second fluid flow To ensure airtightness between the outlet from which the fluid flows out from the passage and the first tubular member and the second tubular member A second tubular member having a sealing member, a biasing member that biases the valve body in a direction away from the valve seat portion along the axial direction, and an inner wall of the first tubular member A projecting portion provided on the outflow side of the seating surface of the valve seat portion with the valve body so as to project inward of the first tubular member, wherein the second tubular member is When the seating surface is moved to the outlet side with respect to the projecting portion by moving along the axial direction with respect to the first tubular member, by contacting the valve body, the An overflow prevention valve comprising: a protrusion for restricting movement of the valve body toward the outflow port.

  In the overflow prevention valve of Application Example 1, when a fluid having a flow rate less than a predetermined flow rate flows from the inlet, the fluid inflow pressure to the valve chamber is relatively low, and thus the overflow prevention valve is provided in the valve chamber. The valve body is not seated on the valve seat portion by the urging force of the urging member, and the first fluid channel and the second fluid channel are in communication with each other, that is, the valve is open. (Non-operating state). Therefore, the fluid flowing in from the inflow port flows out from the outflow port through the first fluid channel, the valve chamber, and the second fluid channel.

  On the other hand, in the overflow prevention valve, when a fluid of a predetermined flow rate or more flows from the inlet, the fluid inflow pressure into the valve chamber becomes relatively high, so the valve body provided in the valve chamber is The first fluid passage and the second fluid passage are disconnected from each other, that is, in a valve-closed state, against the urging force of the urging member. Operating state). The airtightness between the first tubular member and the second tubular member is ensured by the seal member.

  And, in the overflow prevention valve of this application example, after the overflow prevention valve is operated and closed, when the overflow prevention valve is returned to the non-operating state, i.e., the valve open state, The user of the overflow prevention valve connects the second tubular member along the axial direction to the outlet side (downstream in the fluid flow direction), that is, the valve body and the valve seat portion. Move away. At this time, the valve body moves to the outlet side by following the movement of the valve seat portion while being seated on the valve seat portion due to the inflow pressure of the fluid.

  Thereafter, the user of the overflow prevention valve further moves the second tubular member to the outlet side along the axial direction, and the seating surface moves to the outlet side from the protrusion. In such a case, the valve body and the protrusion come into contact with each other, so that the movement of the valve body toward the outlet is limited by the protrusion. At this time, the valve body is separated from the valve seat portion, and the first fluid channel and the second fluid channel communicate with each other. When the first fluid channel communicates with the second fluid channel, the fluid in the first fluid channel flows out from the outlet through the second fluid channel, and The difference between the pressure in the first fluid channel and the pressure in the second fluid channel becomes smaller.

  In addition, when the difference between the pressure in the first fluid flow path and the pressure in the second fluid flow path when the overflow prevention valve is operated to be in the closed state is relatively small, Before the movement of the valve body to the outlet side is restricted by the projecting portion, the valve body is separated from the valve seat portion by the biasing force of the biasing member, and the first fluid The flow path and the second fluid flow path communicate with each other.

  The difference between the pressure in the first fluid channel and the pressure in the second fluid channel is sufficiently small, or the pressure in the first fluid channel and the second fluid When the pressure in the flow path becomes the same pressure, the valve body returns to the non-operating position of the overflow prevention valve by the urging force of the urging member. Then, the user of the overflow prevention valve moves the second tubular member to the non-operating position of the overflow prevention valve again, so that the state of the overflow prevention valve is changed to the non-operating state. Return.

  As described above, in the overflow prevention valve of Application Example 1, the overflow prevention valve is set to the non-operation state after the overflow prevention valve is operated with a relatively simple configuration without using the actuator described above. It is possible to return to the state of time.

It is explanatory drawing which shows schematic structure of the overflow prevention valve 100 as one Example of this invention. It is explanatory drawing which shows the overflow prevention valve 100 at the time of operation | movement. It is explanatory drawing which shows the overflow prevention valve 100 at the time of cancellation | release work. It is explanatory drawing which shows the overflow prevention valve 100 at the time of a return. It is explanatory drawing which shows schematic structure of the overflow prevention valve 100A of a 1st modification. It is explanatory drawing which shows schematic structure of the overflow prevention valve 100B of a 2nd modification. It is explanatory drawing which shows schematic structure of the overflow prevention valve 100C of a 3rd modification.

Hereinafter, embodiments of the present invention will be described based on examples.
A. Overflow prevention valve configuration (non-operating state):
FIG. 1 is an explanatory diagram showing a schematic configuration of an overflow prevention valve 100 as an embodiment of the present invention. In this embodiment, an overflow prevention valve for preventing overflow of high-pressure gas as a fluid will be described. FIG. 1 shows a partial cross-sectional view of the overflow prevention valve 100 in a non-operating state, that is, in a valve open state. As shown in the figure, the overflow prevention valve 100 includes a first tubular member 10, a valve body 20, a second tubular member 30, and a coil spring 40.

  The first tubular member 10 includes an inlet 12 through which high-pressure gas flows, a first gas flow path 13 through which high-pressure gas flowing from the inlet 12 flows, and a valve chamber 14. A valve body 20 is provided in the valve chamber 14 so as to be movable (slidable) along the axial direction of the first tubular member 10 indicated by a one-dot chain line in the drawing. As illustrated, the inner diameters of the inlet 12 and the first gas flow path 13 are smaller than the inner diameter of the valve chamber 14, and the movement of the valve body 20 toward the inlet 12 is limited.

  In the first tubular member 10, a female screw 15 is formed on the inner wall near the end opposite to the inlet 12. Further, on the inner wall of the first tubular member 10, a protruding portion 16 that protrudes to the inside of the first tubular member 10 is located on the outflow port 34 side of a seating surface 31 f of the valve seat portion 31 to be described later with the valve body 20. Is provided. In the overflow prevention valve 100 of the present embodiment, the first tubular member 10 and the protruding portion 16 are the ends opposite to the inlet 12 of the first tubular member 10 when the overflow prevention valve 100 is manufactured. It consists of another member so that the valve body 20 can be inserted in the valve chamber 14 from the opening part of a part. As will be described later, when the overflow prevention valve 100 is released, the protruding portion 16 is connected to the valve body 20 when the seating surface 31f of the valve seat portion 31 is moved closer to the outlet 34 than the protruding portion 16. By abutting, the movement of the valve body 20 toward the outflow port 34 is limited. The function of this protrusion 16 will be described in detail later.

  The second tubular member 30 is mounted inside the first tubular member 10 so as to be movable along the axial direction. In the present embodiment, a male screw 35 is formed on the side wall of the second tubular member 30, and the female screw 15 in the first tubular member 10 and the male screw 35 in the second tubular member 30 are screwed together. In the second tubular member 30, a groove portion 36 is formed on the upstream side surface in the gas flow direction from the portion where the male screw 35 is formed, and an O-ring 37 is formed in the groove portion 36. It is mated. The O-ring 37 ensures the airtightness between the first tubular member 10 and the second tubular member 30. The O-ring 37 corresponds to the seal member in [Means for Solving the Problems].

  The second tubular member 30 communicates with the valve seat 31 on which the valve body 20 is seated and the first gas flow path 13 when the valve body 20 is not seated on the valve seat section 31. When the body 20 is seated on the valve seat portion 31, a second gas passage 33 that is not in communication with the first gas passage 13 and an outlet 34 through which gas flows out from the second gas passage 33 And.

  As shown in the drawing, the coil spring 40 is fixed by fitting into a recess 24 provided in the valve body 20 and a recess 32 provided in a position facing the recess 24 in the second tubular member 30. ing. The coil spring 40 urges the valve body 20 in a direction away from the valve seat portion 31 along the axial direction. The coil spring 40 corresponds to the urging member in [Means for Solving the Problems]. In the first tubular member 10, the gas flow path from the first gas flow path 13 to the valve chamber 14 is secured by the protrusion 22 provided on the surface of the valve body 20 on the inlet 12 side. Yes.

  The overflow prevention valve 100 is provided in the valve chamber 14 because the inflow pressure of the high-pressure gas into the valve chamber 14 is relatively low when a high-pressure gas less than a predetermined flow rate flows from the inlet 12. The valve body 20 is not seated on the valve seat portion 31 by the urging force of the coil spring 40, and the first gas passage 13 and the second gas passage 33 are in communication with each other, that is, the valve is opened. It has become. Therefore, the high-pressure gas flowing in from the inflow port 12 passes through the first gas flow path 13, the valve chamber 14, and the second gas flow path 33 from the outflow port 34 as indicated by broken line arrows in the drawing. It flows out to the outside.

B. Operating state:
FIG. 2 is an explanatory diagram showing the overflow prevention valve 100 during operation. In the overflow prevention valve 100, when a high-pressure gas of a predetermined flow rate or more flows from the inlet 12, the inflow pressure of the high-pressure gas into the valve chamber 14 becomes relatively high, so that the valve provided in the valve chamber 14 The body 20 is seated on the seating surface 31f of the valve seat portion 31 against the urging force of the coil spring 40, as shown in the figure, and the first gas passage 13 and the second gas passage 33 are not in communication. That is, the valve is closed.

C. Status during release:
FIG. 3 is an explanatory diagram showing the overflow prevention valve 100 during the release operation. As shown in FIG. 2, after the overflow prevention valve 100 is operated and closed, the user of the overflow prevention valve 100 uses the overflow prevention valve 100 to use the overflow prevention valve 100 again. A release operation is performed to return the state of 100 to the non-operating state, that is, the valve open state. During the release operation, the user of the overflow prevention valve 100 fixes the first tubular member 10 and rotates the second tubular member 30 about the axis so that the female screw 15 and the male screw 35 are screwed. The second tubular member 30 is moved to the outlet 34 side (downstream side in the flow direction of the high-pressure gas) along the axial direction, that is, in the direction in which the valve body 20 and the valve seat portion 31 are separated from each other. Move. At this time, the valve body 20 moves to the outlet 34 side following the movement of the valve seat portion 31 while being seated on the valve seat portion 31 due to the inflow pressure of the high-pressure gas.

  Thereafter, the user of the overflow prevention valve 100 further moves the second tubular member 30 to the outlet 34 side along the axial direction, and the seating surface 31f of the valve seat portion 31 is formed as shown in the figure. When the valve body 20 and the protrusion portion 16 are in contact with each other when the protrusion body 16 is moved to the outlet port 34 side, the movement of the valve body 20 toward the outlet port 34 is restricted by the protrusion portion 16. The At this time, the valve body 20 is separated from the valve seat portion 31 so that the first gas flow path 13 and the second gas flow path 33 communicate with each other. As can be seen from FIG. 3, even at this time, the airtightness between the first tubular member 10 and the second tubular member 30 is ensured by the O-ring 37.

  Then, when the first gas flow path 13 and the second gas flow path 33 communicate with each other, the high-pressure gas in the first gas flow path 13 flows out from the outlet 34 through the second gas flow path 33, The difference between the pressure in the first gas flow path 13 and the pressure in the second gas flow path 33 becomes smaller. In the case where the difference between the pressure in the first gas flow path 13 and the pressure in the second gas flow path 33 when the overflow prevention valve 100 is operated to be closed is relatively small. Before the movement of the valve body 20 to the outlet 34 side is restricted by the projecting portion 16, the valve body 20 is separated from the valve seat portion 31 by the biasing force of the coil spring 40, and the first gas flow The path 13 and the second gas flow path 33 communicate with each other.

D. Return status:
FIG. 4 is an explanatory diagram showing the overflow prevention valve 100 at the time of return. 3, the difference between the pressure in the first gas flow path 13 and the pressure in the second gas flow path 33 becomes sufficiently small, or in the first gas flow path 13 When the pressure and the pressure in the second gas flow path 33 become the same pressure, the valve body 20 is returned to the non-operating position of the overflow prevention valve 100 by the biasing force of the coil spring 40 as shown in the figure. To do.

  Thereafter, the user of the overflow prevention valve 100 fastens the second tubular member 30 to the first tubular member 10 and again moves the valve seat portion 31 to a position when the overflow prevention valve 100 is not in operation. As a result, the state of the overflow prevention valve 100 returns to the non-operating state shown in FIG.

  According to the overflow prevention valve 100 of the present embodiment described above, the overflow prevention is performed after the overflow prevention valve 100 is operated with a relatively simple configuration without using an actuator for moving the valve body 20. The state of the valve 100 can be returned to the non-operating state. Further, according to the overflow prevention valve 100 of the present embodiment, after the overflow prevention valve 100 is operated, the overflow prevention valve 100 is not disassembled, that is, the first tubular member 10 and the second tubular member. The state of the overflow prevention valve 100 can be returned to the non-operating state without separating from 30.

E. Variation:
Although the embodiments of the present invention have been described above, the present invention is not limited to such embodiments, and can be implemented in various modes without departing from the scope of the present invention. For example, the following modifications are possible.

E1. Modification 1:
FIG. 5 is an explanatory diagram showing a schematic configuration of an overflow prevention valve 100A of the first modification. Similarly to FIG. 1, a partial cross-sectional view of the overflow prevention valve 100 </ b> A in a non-operating state, that is, in a valve open state is shown. As can be seen from a comparison between FIG. 5 and FIG. 1, in the overflow prevention valve 100 </ b> A of the first modified example, a curved leaf spring is used as an urging member instead of the coil spring 40 in the overflow prevention valve 100 of the embodiment. 40A is provided. The configuration of the overflow prevention valve 100A other than this is the same as the configuration of the overflow prevention valve 100 of the embodiment.

  Although illustration and detailed description are omitted, the state of the overflow prevention valve 100A of the first modified example during operation, the state during the release operation, and the state at the time of return are the same. This is the same as the state during the operation, the state during the release operation, and the state during the return (see FIGS. 2 to 4).

  Even with the overflow prevention valve 100A of the first modification described above, similarly to the overflow prevention valve 100 of the above embodiment, without using an actuator for moving the valve body 20, with a relatively simple configuration, After the overflow prevention valve 100A operates, the state of the overflow prevention valve 100A can be returned to the non-operating state. Further, even with the overflow prevention valve 100A of the first modified example, after the overflow prevention valve 100A is operated, the overflow prevention valve 100A is not disassembled, that is, the first tubular member 10 and the second tubular member. The state of the overflow prevention valve 100 </ b> A can be returned to the non-operating state without being separated from 30.

E2. Modification 2:
FIG. 6 is an explanatory diagram showing a schematic configuration of an overflow prevention valve 100B of the second modified example. Similarly to FIG. 1, a partial cross-sectional view of the overflow prevention valve 100 </ b> B in a non-operating state, that is, in a valve open state is shown. As can be seen from a comparison between FIG. 6 and FIG. 1, in the overflow prevention valve 100B of the second modified example, the first tubular member 10B is used instead of the first tubular member 10 in the overflow prevention valve 100 of the embodiment. It has.

  The first tubular member 10B has a substantially straight shape so that the valve body 20 can be inserted into the valve chamber 14 from the inlet 12 side when the overflow prevention valve 100B is manufactured. Further, in the overflow prevention valve 100 of the embodiment, the first tubular member 10 and the protruding portion 16 are made of different members, but the first tubular member in the overflow prevention valve 100B of the second modification example. In 10B, the protrusion 16B is integrally formed with the first tubular member 10B. Further, a C-ring 17 for restricting the movement of the valve body 20 toward the inlet 12 is provided on the inlet 12 side of the valve body 20 in the first gas flow path 13. The configuration of the overflow prevention valve 100B other than these is the same as the configuration of the overflow prevention valve 100 of the embodiment.

  Although illustration and detailed description are omitted, the state of the overflow prevention valve 100B of the second modified example during operation, the state during the release operation, and the state at the time of return are the same as those of the embodiment. This is the same as the state during the operation, the state during the release operation, and the state during the return (see FIGS. 2 to 4).

  Even with the overflow prevention valve 100B of the second modified example described above, similarly to the overflow prevention valve 100 of the above-described embodiment, without using an actuator for moving the valve body 20, with a relatively simple configuration, After the overflow prevention valve 100B operates, the state of the overflow prevention valve 100B can be returned to the non-operating state. In addition, the overflow prevention valve 100B of the second modified example also does not disassemble the overflow prevention valve 100B after the overflow prevention valve 100B is operated, that is, the first tubular member 10B and the second tubular member. The state of the overflow prevention valve 100B can be returned to the non-operating state without separating the current from 30.

E3. Modification 3:
FIG. 7 is an explanatory diagram showing a schematic configuration of an overflow prevention valve 100C of a third modification. Similar to FIG. 1, a partial cross-sectional view of the overflow prevention valve 100 </ b> C at the time of non-operation, that is, when the valve is opened is shown. As can be seen from a comparison between FIG. 7 and FIG. 1, in the overflow prevention valve 100C of the third modified example, the first tubular member 10C is used instead of the first tubular member 10 in the overflow prevention valve 100 of the embodiment. It has.

  The first tubular member 10C has a first member 10a having a substantially straight shape and a through hole having an inner diameter smaller than the inner diameter of the first member 10a, and is connected to the inlet 12 side of the valve body 20. It consists of the 2nd member 10b which restrict | limits a movement. Similarly to the first tubular member 10B in the overflow prevention valve 100B of the second modified example described above, a protruding portion 16C is integrally formed on the first member 10a. As shown in the figure, the first member 10a and the second member 10b are screwed together with a female screw formed on the inner wall of the first member 10a and a male screw formed on the second member 10b. To be combined. Between the 1st member 10a and the 2nd member 10b, the sealing member which is not shown in order to ensure the airtightness of the 1st member 10a and the 2nd member 10b is provided.

  In addition, although illustration and detailed description are omitted, the state at the time of operation of the overflow prevention valve 100C of the third modified example, the state at the time of release work, and the state at the time of return are the same. This is the same as the state during the operation, the state during the release operation, and the state during the return (see FIGS. 2 to 4).

  The overflow prevention valve 100C of the third modified example described above also has a relatively simple configuration without using an actuator for moving the valve body 20, similarly to the overflow prevention valve 100 of the above embodiment. After the overflow prevention valve 100C operates, the state of the overflow prevention valve 100C can be returned to the non-operating state. In addition, the overflow prevention valve 100C of the third modified example can be used without disassembling the overflow prevention valve 100C after the operation of the overflow prevention valve 100C, that is, with the first tubular member 10C (10a, 10b). Without separating the second tubular member 30, the state of the overflow prevention valve 100C can be returned to the non-operating state.

100, 100A, 100B, 100C ... Overflow prevention valve 10, 10B, 10C ... First tubular member 10a ... First member 10b ... Second member 12 ... Inlet 13 ... First gas flow path 14 ... Valve Chamber 16, 16B, 16C ... Projection 20 ... Valve 22 ... Projection 24 ... Recess 30 ... Second tubular member 31 ... Valve seat 31f ... Seating surface 32 ... Recess 33 ... Second gas flow path 34 ... Flow Outlet 35 ... Male thread 36 ... O-ring 40 ... Coil spring 40A ... Leaf spring

Claims (1)

An overflow prevention valve,
A first tubular member having an inflow port through which fluid flows from the outside, a first fluid flow path through which the fluid flowing in from the inflow port flows, and a valve chamber;
A valve body provided in the valve chamber so as to be movable along the axial direction of the first tubular member;
A second tubular member mounted in the first tubular member so as to be movable along the axial direction, wherein the valve body is seated, and the valve body is the valve seat portion. The first fluid flow is communicated with the first fluid flow path when not seated on the valve body, and when the valve body moves along the axial direction and is seated on the valve seat portion. A second fluid flow path that is not in communication with the path, an outlet through which the fluid flows out of the second fluid flow path, and the first tubular member and the second tubular member. A second tubular member having a sealing member for ensuring airtightness;
A biasing member that biases the valve body in a direction away from the valve seat portion along the axial direction;
A projecting portion provided on the inner wall of the first tubular member so as to project inward of the first tubular member on the outflow side of a seating surface of the valve seat with the valve body; The second tubular member is moved along the axial direction with respect to the first tubular member, so that the seating surface is moved to the outlet side from the projecting portion. A projecting portion for restricting movement of the valve body to the outlet side by contacting the valve body;
An overflow prevention valve comprising.

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